PDF Reviewer is a cloud-based service that enables users to annotate PDF files in Markdown syntax, with support for Latex Equations. It is a paid service with free trial(until Aug 31, 2022), but no credit card is needed for the trial. Readers are encouraged to check it out.
When I was reading academic papers or engineering books, I wished I had a PDF reader that can help make rich-format text annotations. I tried many tools, such as Adobe PDF reader, Microsoft Edge, etc. They're really good and helpful. They have so many features helping users navigate contents easily and fluently. But what I really wanted are two features:
- Annotate PDFs in markdown, so I can freely use rich-format text annotations. More preferably, equations are supported.
- View PDF files and annotations side-by-side.
I wanted the two features so much that I decided to build a service on my own. That's why PDF Reviewer came out. It doesn't have so many nice features like any other desktop-based PDF readers, but it has the missing two features.
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